This is common. The bid and ask on options are usually just the market maker and it will sit a little wider than it could be if there is someone wanting an active trade. It's the default idle state. It's why you can see 200 on the bid at 0.30 then it drops all the way to 0.20 and not a single option trades. There was no buyer sitting at 0.30 just waiting to get some it was just the market maker having them available so if someone did want to buy or sell. The moment we put our trades in the computers wake up, they become more interested now they know a fish is nibbling. You can sometimes improve a trade a few cents by playing games with them, I believe I described this before. Several times just keep changing your bid or your ask . Push it till you see you are on the only bid. Then move it back then in again and you can sometimes get the market maker to take your trade at a better price for you.
It just important to remember that the bid and ask sizes and prices you are seeing are not real in the sense you might think they are. There is no sanrith out there sitting at that bid. If you watch all day you can see when the actual trades come along and how the behavior changes. When it's just you it's easiest to see how things are adjusting.