Seeds starting to form but no bananas in sight. Wtf?

Well my best grow to date has hit a huge wall. I am 4 weeks into flowering and on 4 of my plants (LSD strain), I can see tiny seeds forming. I have searched every plant three times over for some ball sacs but none to be found. The other 20 plants I have, 18 OG Kush and 2 of the LSD look unaffected. Some hairs are changing colors on them but not shriveling like the pollinated ones. Is it safe to say that they are all inevitably going to get pollinated. Should I pull the ones that are pollinated? I also have a fresh batch ready to go into the tent, should I wait until these are done with flowering, clean, and then put in the new plants? Any help on this topic would be greatly appreciated. A link to some useful information would be the best but I have searched extensively with no luck.
Thanks, Bilbo.

The first seed I saw.



The tent.




Link to the journal is in my signature.

They need pollen to make seeds, so you must have missed a banana. Or a jelouse friend placed some rouge pollen for you.

i put a few seeds in my very first grow handling bag weed maybe you came in contact with pollen

Is it possible for only a few seeds to form on a few plants? The girls were packed in pretty close together.