My instaread and another cheap temp probe both read 45 just like 2 of these are
Have you tried mixing up the probes into different ports?
Contact Inkbird and explain the issue, they may replace the probes. They do have a 1 year warranty.
Did you immerse the probes in water? I understand that they are not designed for this. I wash mine by hand and make sure water does not seep into the probe past the crimps.
What about a boil water test?
Try the probes one at a time see what they read . The one that reads 110 and 73 are in ice water ?
Bad probes. Which is why I test my probes at 3 different temps. Ice, 100, 212