Two different ceramic decoupling capacitors in parallel
Assuming your brand new cap is still in good condition, without internal shorts... if it gets hot this is due to ripple current from the nearby DC-DC chip.

Every capacitor has an internal resistance (Equivalent Serial Resistance or ESR) which dissipates power equal to RI^2 when current I flows through it.

If this cap is at the input of a DC-DC converter then it will take a substantial ripple current.

The solution would be to use a cap with lower ESR, which probably means a higher value in X7R or X5R dielectric.

Note a ceramic cap will work fine at 75°C.