Problem could be your Throttlestop program which isn't needed at all for that CPU.
Throttlestop is for those lazy folks who doesn't want to improve their PC cooling and instead are using software which both undervolts and underclocks their CPU, so that CPU temps won't go past the value they don't want to see.
The in-game temps what are you getting are completely normal and fine for i5-4460. Heck, even if CPU temps would be 10°C higher it still would be completely fine. If your CPU temps under load would be 80°C and up, then you may start worrying since like i said, when CPU reaches 90°C and more, then
and only then CPU thermal throttle begins. With the low temps your CPU is producing, there is
no CPU thermal throttle and no need to use Throttlestop program whatsoever. Moreover due to the fact that when you start Throttlestop program, it actually
increases CPU temp by 14°C, not lowering it.
Start your Throttlestop, reset all the values to default, uninstall it completely, make a reboot and then check how your CPU temps and clocks are, both on idle and in-game.
For CPU thermal and frequency monitoring, HWinfo64 is good program since it also comes with logging (recording) feature,
link:
https://www.hwinfo.com/