Ok, i change rear motor mount, check the oil clutch level.
The problem its to shift sometimes.

I can drive sometimes and meke the shift so smoth, whitout problems but some days, for a example i got a bump, well i reduce the speed, and need to start in 1st gear but i cant i need to wait some seconds and then 1st get so smooth and second and third and 4th all gears, feel like a bad engine position, but mounts are new.

Any clue wath could be?

Could be a syncro

It sounds more like a gearbox problem.
My friend experience the same thing.
Not shifting smoothly between gears.
He change the gearbox oil to redline
and it was much better.

Also the clutch and pressure plate are news,

ok, are you having issues shifting in all the gears or just going back to first.

i cant specify what is wrong if all your gears are having issues, it could be a number of things.

HOWEVER, if its just the bump going to first, its supposed to be like that. Its a safety to keep people from going into first above 5-10mph. First is used to start off and this it. You should not have to downshift to first.

just in first gear at low speed like 2-3mph

well its just your safety measures built into the transmission. its to keep from downshifting, like a moron.

yes its annoying as crap sometimes, but you will have to deal with it. no way to fix it.