ram size

So I opened my case and I realise that my ram are not connected in dual channel so I change their position. But now window in the task manager show me that I have only 8gb (I have 2 8 gb ram) but in the bios and on cpu-z it show me that I have well 16 gb what is the problem ? thanks in advance :)

I have an x570 tachi, also an msi rtx 2080 ventus and I would like to kow if the cooler is to big for 4X8 (32gb) of trident z neo 3600 speed, also I know it will fit in my case

Hello! I have searched and found mixed messages on this, so I figure if I have all the info pertaining to my situation it might help. I know that RAM is a fickle mofo and there are always variables but what I am trying to do is this: I have these in my computer now: Corsair Vengeance LPX 32GB...