m0useanswered grow question 3 years ago lower the heat and raise the humidity. 29c/85f and 27RH is to high and to low.
RH should be around 50-60%
temps around 24-26c/75.2-78.8f
leave the leafs till plant grows out more. and see if its still happening after the other changes you implemented.
also seems to only be the leaves touching the LECA,