I have a certain suspension what could be wrong. Here I have played a bit alternative WW1. I have not attacked France over Belgium, but I first concentrated all my forces on the Russian front. France didn't attack me once in the whole war, Austria Hungary was also doing nothing, the Ottomans have not joined my war effort, but also didn't Japan, later USA (Maybe it has also something to do with the unrestricted submarine warfare event which I declined) and other Commonwealth countries since I didn't attack over Belgium.
The tanks are so cute when they are little lol. And you sure that, that is the right picture for experimental plane lol? It looks like more experimental for WW2.
Well after one year, after the start of the war, I have defeated the Russians and have relocated my forces to France and some lesser units to Serbia to get rid of the country.
Then suddenly everything started to move. At first Austria Hungary started to relocate large portions of their army to the French front. Although they didn't try to attack they had about 50 divisions there.
And out of surprise they also started an attack against Serbia even before my forces from Russia could arrive.
The Entente also started moving. They started to bombard me (They didn't do that before). And started to take my undefended African colonies (They had 1 year to do this, but didn't). They didn't attack me in Europe probably because I secured my border with them with level 10 forts.
AH has removed their forces eventually and moved them to the Italian front once they attacked. Both sides remained in a stalemate. In the meantime, I declared war upon Belgium and Netherlands. With that also Japan and the commonwealth countries have also declared war upon me. USA was neutral till the end of the war with the Entente.
Hindenburg has seen the horrors of war on all fronts.
Well after France was defeated a part of my forces was sent to Italy, were the country has surrendered in half a month after the start of the attack, a second part of my forces has landed in UK where they achieved a fast victory. After the defeat of the entente, there was a chance to declared war upon USA. I did that, but just when I wanted to prepare for the invasion they also did get an defeat even out of nothing. Soon the negotiated peace events fired and I got huge land concessions. I'm still waiting that something cool happens to Belgium (They get annexed by me, or I get their colonies lol).
Well it seems there is something wrong about Russia or the other AIs coneted to russia. I will try to find out more.