I'm using Ethplorer to check my wallets and track my tokens if the token I waited coming from bounties have finally arrive in my wallets, I have so many shit tokens in my wallet that are sitting in my wallets for years but I notice that some coins do not have value in Ethplorer whereas in Etherscan they have value, did you also notice that, which of the two are you using to check your wallet.
I only use etherscan since joining the crypto world and joining projects that use the erc-20 chain. There is no specific reason actually, because I am more familiar with using etherscan and it looks more attractive. Regarding the value that does not appear in one of these trackers because the value is too small, the price and volume in the market are low, IMO. This is actually not a technical problem that you should be confused about, if you really want to know the price directly then you can check the social media coins or tokens to find out the exchange that is used, or can immediately see it on Coingecko or CMC.