Yes - there was a consolidation action of 1 for 1500 of these securities : https://www.sharesmagazine.co.uk/news/market/LSE20210504170819_3963598/GraniteShares-3STS-Reverse-split-Consolidation
I've been on chat and on the phone to IG - they've done the consolidation, but still not updated the correct prices, which should of course also rise by ~1,500 on a ceteris paribus basis (all things the same). At the time of writing this, TSLA has dropped a further 2.4% today, so these securities ought to have risen ~ 7.2% (3x short TSLA) on the day.
The IG person I spoke with this evening promised me he would check with the relevant team and revert. My call was very late in the day (after 6pm) so I trust that they will have this resolved in the morning. If not, I do suggest calling again.