From the sounds of it, probably not. Fluid level in all Kubota tractors, no matter if gear drive or HST, will be just BELOW the height of the bottom of the pro stub when the tractor is sitting level. No matter what model or year or type, that is where the full fluid point will be.
Get a hold of that errant dipstick with a pair of vice grips and yank hard on it. It will come out. What you need to do to make sure the dipstick is the correct length is... Measure from the top of the case casting where the dipstick inserts at, to the bottom of the pto stub (approximately ) and used that dimension to ascertain if the dipstick marks coincide with that measurement. The 'full' mark on the stick should be at that measurement or close to it. If not, you have the incorrect dipstick or you will need to engrave the correct marks on it.