Is it normal for the lines to bunch up when using slicer

I'm printing with 95% infil. I find that the printer prints a line then comes back and prints another one , then these two are touching when it goes to print the next parallel line to those two it is not touching. It seems that there is only a space between every other line.
I'm using a Folgertech prusa i3 and repetier host. I'm trying to do a fine tune of the esteps. If you look and zoom into the picture you can see it. Anyone else have this?

Did you stop the print midway for the picture above? 95% isn't like top/bottom solid infills though unless you're using 100%

I did stop that print. Theres only a space between every second parallel line of infil that is printed. There should be a space between every line or no space at all I don't know why its doing this. Any thoughts?

Edited 1 time(s). Last edit at 01/08/2016 11:18AM by igel.

Is probably slack in the belts or frame.