There is conflicting information about this. This forum post claims they never went over 50% but had a short time with about 40% which enabled them to do some selfish mining with a reorg what enabled them to find 50% of the blocks for some time. Currently however data seems to suggest they have around 30%. According to this site, ~26% of the hashrate is of unknown origin (which could be Qubic, among others) and the rest are bigger Monero pools.

Edit: also BitMEX wrote that they never reached 51%, see here. Their suspicion is also that the reorg was a small successful "selfish mining" attempt.

Apparently there was a massive social media attack going on to try to convince miners to join Qubic's pool, but they failed at that afaik.

There is conflicting information about this. This forum post claims they never went over 50% but had a short time with about 40% which enabled them to do some selfish mining with a reorg what enabled them to find 50% of the blocks for some time. Currently however data seems to suggest they have around 30%. According to this site, ~26% of the hashrate is of unknown origin (which could be Qubic, among others) and the rest are bigger Monero pools.

Apparently there was a massive social media attack going on to try to convince miners to join Qubic's pool, but they failed at that afaik.