Welcome to Ostheer, where building a healing bunker and/or resource cache means the exact same thing, making for a suicidal choice unless you're already ahead.
It's absurd just how much munitions OKW and Soviets float pretty much at all times in every match, while Ostheer is ALWAYS starved for Munitions.
If USF has finally joined the club (whether regarding manpower or munitions), maybe someone will actually take a look at resource income/consumption disparities between factions after years of such problems?
What game are you playing?

There is no need at all to upgrade grens if you have 1-2 HMG42 and use them well. What on earth are you investing all your munitions in?? Nooby rifle nades?
A healing bunker, maybe 1-2 tellers, a few nades and fausts, and maybe a flamer upgrade for 251 or pioneer if it's an urban map... that's literally all the mun investments you need in the first 20 minutes of the game (and it's exactly what most
good Ostheer players do). Waiting with the lmg42 upgrade until the grens are vet 2 or 3 is much much better.