diff --git a/projects/core/src/lib/classes/mask-model/utils/guess-valid-value-by-reg-exp.ts b/projects/core/src/lib/classes/mask-model/utils/guess-valid-value-by-reg-exp.ts
index 169c63827..845bd7432 100644
--- a/projects/core/src/lib/classes/mask-model/utils/guess-valid-value-by-reg-exp.ts
+++ b/projects/core/src/lib/classes/mask-model/utils/guess-valid-value-by-reg-exp.ts
@@ -22,5 +22,11 @@ export function guessValidValueByRegExp(
         return newPossibleValue.match(maskRegExp) ? newPossibleValue : validatedValuePart;
     }, '');
 
-    return {value: validatedValue, selection: [newFrom, newTo]};
+    return {
+        value: validatedValue,
+        selection: [
+            Math.min(newFrom, validatedValue.length),
+            Math.min(newTo, validatedValue.length),
+        ],
+    };
 }
diff --git a/projects/demo-integrations/src/tests/component-testing/number/mirrored-value-postfix.cy.ts b/projects/demo-integrations/src/tests/component-testing/number/mirrored-value-postfix.cy.ts
new file mode 100644
index 000000000..5cc067588
--- /dev/null
+++ b/projects/demo-integrations/src/tests/component-testing/number/mirrored-value-postfix.cy.ts
@@ -0,0 +1,34 @@
+import {maskitoNumberOptionsGenerator} from '@maskito/kit';
+
+import {TestInput} from '../utils';
+
+describe('Number | [postfix]=" EUR" (no initial value & no caret guard)', () => {
+    beforeEach(() => {
+        cy.mount(TestInput, {
+            componentProperties: {
+                initialValue: '',
+                maskitoOptions: maskitoNumberOptionsGenerator({
+                    postfix: ' EUR',
+                    precision: 2,
+                }),
+            },
+        });
+        cy.get('input').focus().should('have.value', '').as('input');
+    });
+
+    it('Empty input => Paste "11.22 " => 11.22 |EUR', () => {
+        cy.get('input')
+            .paste('11.22 ')
+            .should('have.value', '11.22 EUR')
+            .should('have.prop', 'selectionStart', '11.22 '.length)
+            .should('have.prop', 'selectionEnd', '11.22 '.length);
+    });
+
+    it('Empty input => Paste "11.22  " (with two trailing spaces) => 11.22 |EUR', () => {
+        cy.get('input')
+            .paste('11.22  ')
+            .should('have.value', '11.22 EUR')
+            .should('have.prop', 'selectionStart', '11.22 '.length)
+            .should('have.prop', 'selectionEnd', '11.22 '.length);
+    });
+});
diff --git a/projects/kit/src/lib/processors/postfix-postprocessor.ts b/projects/kit/src/lib/processors/postfix-postprocessor.ts
index 4595d8f0f..61d1b62b8 100644
--- a/projects/kit/src/lib/processors/postfix-postprocessor.ts
+++ b/projects/kit/src/lib/processors/postfix-postprocessor.ts
@@ -26,7 +26,7 @@ export function maskitoPostfixPostprocessorGenerator(
                   '',
               );
               const postfixWasModified =
-                  initialElementState.selection[1] >= initialValueBeforePostfix.length;
+                  initialElementState.selection[1] > initialValueBeforePostfix.length;
               const alreadyExistedValueBeforePostfix = findCommonBeginningSubstr(
                   initialValueBeforePostfix,
                   value,
diff --git a/projects/kit/src/lib/utils/extract-affixes.ts b/projects/kit/src/lib/utils/extract-affixes.ts
index 4acfacd31..86f03c919 100644
--- a/projects/kit/src/lib/utils/extract-affixes.ts
+++ b/projects/kit/src/lib/utils/extract-affixes.ts
@@ -14,7 +14,15 @@ export function extractAffixes(
     const [extractedPrefix = ''] = value.match(prefixRegExp) ?? [];
     const [extractedPostfix = ''] = value.match(postfixRegExp) ?? [];
 
-    const cleanValue = value.replace(prefixRegExp, '').replace(postfixRegExp, '');
-
-    return {extractedPrefix, extractedPostfix, cleanValue};
+    return {
+        extractedPrefix,
+        extractedPostfix,
+        cleanValue:
+            extractedPrefix || extractedPostfix
+                ? value.slice(
+                      extractedPrefix.length,
+                      extractedPostfix.length ? -extractedPostfix.length : Infinity,
+                  )
+                : value,
+    };
 }