Sticker with maximum permissible weight on the trailer.

Hello people I work in a freight forwarding company with 40 tonns (so it is also in the registration), now stickers with „maximum 25.000kg payload” were installed everywhere, the vehicles weigh fully fuelled but maximum 14.300 kg (so I can charge 25.700kg). This is mainly for the shippers… Now I had loaded: gross: 39.800 kg Empty: 13.600 kg Net: 26.200 kg Now I was stopped by the BAG and they said: overload 1.2 ton… Because the sticker is binding, no matter what in And if so, what law does that say? Greetings of a perplexed Walter