Proxy Users disappear (8 out of 10) in one Mailbox

Strange issue here:

One user has 10 Proxy entries in his mailbox. Since last week, 8 of them disappeared. 2 are still there.

User again created all proxies without problems. Today the 8 proxies again disapeared (happened twice). The 2 left proxies are the same as last week.

Hint: Last week we deleted one account (user left the company), this account was proxied before by this user, but the deleted user was automatically deleted in Proxy list. (see https://ideas.microfocus.com/MFI/mf-gw/Idea/Detail/444)

GWCHECK says everything is ok with this mailbox. Is there a hidden (misc) option we can run?

Client 14.2.3 btw...

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