Pronterface won't let heat up hotend past 260

Hello, i'm trying to heat up experimental hotend, however i'm having an issue with Pronterface not going past 260 on the hotend. It lets me set the temperature, says that it starts heating, lets say to 265, however at the bottom, where the temperature is displayed in says 260 as a target temperature. Once it is reached, the temp hovers around 260. I can't find it neither in Pronterface settings nor in Marlin (275 limit set), i have disabled thermal runaway for testing as i have a very powerful fan that was constantly triggering the fault.
PS Thermistor that i'm using is NTC 3950 100 К, i'm not sure if i have chosen correctly, but i have matched it with: 11 : 100k beta 3950 1% thermistor (Used in Keenovo AC silicone mats and most Wanhao i3 machines)

UPD Changed thermistor to default "1" option, still the same, displays: T: "live temp reading"/260 B: -15.00/0.00 @ :127B:0

Edited 2 time(s). Last edit at 08/06/2020 02:53PM by AlexPl.

The max temp that you can set will always be 15º lower than what you set as the max temp in Marlin. This is so that the printer doesn't trigger thermal runaway when it overshoots. Even if you disable thermal runaway, it will still use this 15º difference.

If you want to print at 265º, set the maxtemp to 280º in Marlin

Edited 1 time(s). Last edit at 08/07/2020 03:23AM by Ohmarinus.

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http://www.marinusdebeer.nl/

Thank you so much!!!