Strange API results for ERGO "pendingShares"

[eshcrow]

For example:
In NBminer 568 good shares
In Miningcore API:
{
"pendingShares": 1.011254621316767,
"pendingBalance": 0,

and then, when the number of accepted shares increases, the value after the comma increases:
1.0376587653759264,
1.0404512387629559 etc