Temperature issue after Marlin 1.1.9 upgrade

[makeiteasy3d]

I have noticed that after upgrading my CR10-s to Marlin 1.1.9 I cannot set my nozzle temp beyond 235C, despite having set the max temp to 250C in config.h (HEATER_0_MAXTEMP 250)
I am fairly sure I could go higher than 235C before the update. (don’t know if someone with a cr-10s on stock firmware could confirm this?)

I have also noticed that the PLA+ I am printing with seems to go down noticably better when set to a higher temp than what I had previously used for the same roll of filament before updating.
I am wondering if the printer could be reporting a higher temp than what the nozzle is actually reaching, and if that is related to whatever is stopping me going beyond 235C?