The latest results are based on 13,551 interviews with registered voters, collected from March 11- 17, 2019.
Beto announced on March 14th, so half of that polling data is pre announcement. The announcement about his record breaking 1st day haul was made on March 17th.
Kamala announced on a Monday and Bernie announced on a Tuesday (their 7 day polling is Monday to Sunday).
Above and beyond that, he had a rough week in the press with people making mountains out of molehill over expressions he's used, the way he speaks, harmless jokes about how much he's away from home, etc etc.
I think you (and that website) are really cherry picking.
Yes, there will be new polling data soon available, don't know why you're rushing to select one that has an obvious bias issue (not political bias, just scheduling bias because you're comparing two early week announcements to a late week announcement).