Help please with 1.1.9

[hyoslvr]

I believe it's 1/4x16 acme threaded rod, or whatever came on the printrbot simple metal. It's stock factory as far as I know, I bought the printer used and it was never replaced that I know of. Any way i dropped the new Marlin in it today (2.0). Now it homes to the 0 position, but if I put an offset in the firmware it still refuses to lower the nozzle any lower. The lcd and slicer both register the offset, meaning if I put the offset in Marlin firmware at -1.00 or just 1.00 and home the Z, after homing is complete it will now show whatever value I set as the offset. However the nozzle is not higher or lower. I'm using paper as a feeler gauge and the nozzle height is always the same, doesn't matter what it says the offset is. I don't know.

[hyoslvr]

Just tried to run a test print. Homed the Z axis to 0, then brought it down .1 at a time until it just grabed the paper, (at .3). Went into marlin and added a 0.03 offset, since I figured it is backwards like my last post stated. Probe heated, went through the 3 point auto level, then started the print at Z level .3 according to the lcd. No idea why it did with an offset of .3? Anyway still reading and trying to figure it out.