WIK Mod.9757 Brewing group causes problems

Hello,
is new here in the forum.
I have the following problem since today:
My WIK Cremaroma 9757 has been running smoothly for years.
Cleaning and decalcification programs always performed regularly.
Only the brewing group I had never removed..because I know..that this always brings problems
.Have a 14 year old Jura E 40..with fixed brewing group and never had problems.
Today I have removed at the WIK..the brewing group..and cleaned.Then after introduction again inserted.And.....Water and coffee are running into the marc container...!!!Have set everything up dozens of times...but nothing works anymore...!!! Annoy me already black..that I have removed the brewing group. Maybe someone can give me a good tip. Have...as I said..tried everything according to the operating instructions..!!