tricomes question

second grow and second time this has happened

when i start flowering my plants are covered in trics look lovely half way throu but by the end of flowing most seem to have vanished or seem to look like there drying up.
this has happened to three kind of plants
thcbomb
northern lights
g13 powerskunk
all three ov these plants produced nice amount of bud potency was weak on all.
i see pictures on here rollitup and your buds are covered in trics

so its something im doing wrong

any suggestions
thanks

this is my set up growtent with a 600w cooltube, temp controller that i try to keep heat @ 85 lights on, 75 via tube heater @night, 1 fan pumping fresh air in 1 extracting hot air, i leave these running slow then when growroom heats up to my set temperture controller kicks in, i also have a delonghi (something like that) de-humidifier that runs continous in tent humidity always seems to be @ 60% biobizz soil/nutes in 11l pots