cura print height is off

[kosh142 0]

Hi all. needing some help.
After having issues with print quiality i removed cura 4.8 and installed 4.13. but now print height is short. a part that is 20mm height in model and in cura but prints 1mm short. The X and Y measure 19.9mm which i expect
Printer is ender pro v2.
previous version i had installed printed exactly as expected, despite some outter shell quality problems.
so before i wiped 4.8 off i backed up my profile and reintroduced it to 4.13, a couple of minor things i had to change back is all.

now printing for a model that previously work perfectly is having size of parts issues.

I thought it was top and bottom layers count..seems not. i thought it was printer setup (dimentions) not setup right, seems not. i have double checked the carriage and the bed bearrings (even replaced them all) yet still no cigar.
I cannot believe that it is the printer itself as that has not changed only the version of cura.  Are there aliens in 4.13 that i dont know about?

Thanks in advance.