I think that more people sick after boosters is just timing, more boosters have been going out as Omicron expands. This bias in the data is just one of the problems with reported numbers. It most emphatically does
not mean that getting your boosters is a bad idea. The likelihood of serious disease is dramatically reduced by boosters, contrary to what these numbers might suggest.
Another problem with the data at the moment is that, unfortunately, the numbers of reported Omicron cases is a serious underestimate of current number of new cases in our communities. There are now two huge limitations in this data. First, the delay between becoming infected and receiving test results means that the number of positive tests reported is something like ten or so days out of date. When infections are expanding as quickly as they are with Omicron, that delay means that there is far more cases out there than can have been tested and confirmed yet, as in perhaps 4-8 times as many (>9 days at 3 day doubling times for those who care).
In many jurisdictions, the second now worsening limitation is that testing capacity is starting to be exceeded. At the rate Omicron is expanding, this seems likely to get worse for a while yet.
Stay safe peeps, there is more of this stuff circulating now than reported numbers suggest. Lots more.