( HOI2 )Troops not moving into enemy territory- bug?

[0N3]

I'm playing a mod (modern day scenario) so that may be the problem. I have invaded several countries without problems already, but when i attack Germany the game/mod bugs. The moving animation starts, the ETA show 6 april, but the troops are not attacking the forces in the enemy province and when it reaches 20 april they have not advanced one step. Is it any in-game mechanics that can do this , something fixable or a complete game-breaking bug?

[Tankfriend]

Do you (or the units in question) happen to be out of oil or supplies? Other than that, I think you might have hit a bug.

[Pickle_mole]

i can only think of supplies/oil. Also check on if your unit is able to attack, since there is a limit on attacking every X amount of hours maybe that portion of the game is bugged.