Sponsors don't disappear

[Vbommel_1_NL]

I have started playing OSM again after many years so perhaps I am overlooking something, however... I picked my sponsors in the beginning. One for 5 rounds, the other 4 etc. One was for 1 playround however after 4 rounds of matches this I still can't reselect a new sponsor and I am stuck with the old one for poor money. Why don't the sponsors diappear after the amount of rounds they should disappear so I can reselect new ones?

Thanks for the help!