polar/rectangular grid dimensions inconsistent

[nadrojxinnam]

hello, i'm using polar and rectangular grids to make patterns and logos etc, but just noticed, the dimensions of the grid are never exactly square, sometimes by just .001 of a px but still, can never get them to match, with proportions constrained, any help much appreciated

[Met1]

You're asking for a purley aesthetic reason (it's annoying) rather than a production reason, cos even a flea isn't going to notice .001 px mis-measure...

[nadrojxinnam]

fair enough, but sometimes it's morre like 1px, i mean why does it happen? i enter the desired values and they just change . . 

[Ton Frederiks]

Which Illustrator version and what System?