"extremely difficult" - yeh, PPFD changes a lot with just a small change in where the sensor is located. A change of 1" (vertically) can be 50µmol. I take multiple light readings ("samples") once the plant is > about 3 weeks. I use a grid pattern, like I've shown below. I've had a few times when the numbers don't make sense so I go back and sample the canopy again. Even though I'm trying to get the sensor in the same location, the numbers are different by maybe 50µmol because I can't get the sensor in the same location.Right now I’m at 23.5 inches - but that being said the plants exploded the last two days . I honestly was guessing around 30 inches - This is measured from the bar to the top of the canopy in the middle . I’ll check it again right now actually , as I’m typing this , and even take a picture of the meter .
Now I can’t exactly hold the meter perfectly level with the canopy - and take the picture “extremely difficult “ lol
Measuring to the top of the plant I took the reading to the bar in Right at 23.5 inches and 1100 .
That leads to the conclusion that, measuring PPFD can be very precise (the meter is very accurate) but measuring PPFD itself is not more than a guide. More on that topic.

Call it 1100 at 24". The manufacturer says that their light cannot generate that much light and the PPFD map that they display for that light fits in with the type of product that Kind designs and manufactures.
That's why I suggested that you run ClearSky and check your meter. Those readings could be because the meter is off or, as you say, something's up with your light. The fact that it's generating a lot of heat might be an indication. Have you checked the wattage that it's drawing from the wall socket? Another issue—does the info on the driver indicate that it's a 750 watt driver?