Malt for freelancers - Why are my exchanges moderated for so long ?

I’ve been using Malt as a freelancer for a long time to find new clients, but recently I’m getting many opportunities each day, which answers to end up being moderated… basically forever, it takes months before the client can read the messages

I talked with the Malt support but didn’t get any useful answers or explanations

Had anyone got the same issue than me ?