hole not printed well with Repetier 1.0.6 with Grid

I'm using 1.0.6 and grid support for some prints. (cura engine)
I found that if i do not use grid support, holes are better printed.
But, with grid (for some prints, i need to use this rather than Line support), the hole not printed well, the hole is just liken rotten thing.
After observavtion, i found that the hotend won't run a circle, instead when printing the hole, it complete just about 2/3 of the circel, which led to the broken or rotten effect.
I have another printer using Cura as control software. The hole with grid support is pretty solid, very good.
I noticed that when printing the hole, it will complete 100% circle printing or even more.
How to deal with this?
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