Is 300mb a fixed size of the mempool or just how the mempool tool did their UI?
The mempool is not a global state. It runs in the RAM of your computer when you run a full node. Most people have theirs set to the default of 300MBs, but I have mine set to 2000MBs, but I'm also running full RBF on my node. So if you send a tx at a higher rate, it'll either get replaced on computers with full RBF, or replaced on computers which are dropping low fee txs due to their mempool size limits.
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It's the configured default mempool size is my understanding, so most relaying nodes are purging low fee txs to maintain that size.
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sometimes it happens that you lost the transaction but after a while it get confirmed. so maybe the miners increased the size, but the nodes that broadcast the transaction did not.
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