I have a big box of villagers where you have to parkour to get into and a big base either lights surrounding everywhere but mobs seem to spawn everywhere, even more than before and I added even more lights. In my villager box, a creeper spawned even though there's no possible way in can parkour in or spawn in, there's a torch on every block on the wall. My difficulty is on normal but the mobs are so plentiful.
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It looks like you do not have enough light to prevent monster spawns. Keep in mind that torches have a light level of 14, monsters spawn in in light level 7 and below, and spawning is based on the light level of the space just above the gound. You may find it helpful to temporarily turn off smooth lighting (in video settings) to see how the light levels change block by block. For more information on calculating light levels see the Minecraft wiki.
To take you second picture, for example, between the torches the light goes like this:14 13 12 12 11 10 9 10 11 12 13 14
13 12 11 11 10 9 8 9 10 11 12 13
12 11 11 10 9 8 7 8 9 10 11 12
So you can see the 3 blocks in from the fence there is a block with light low enough for monsters to spawn.
In previous versions of Minecraft, it was common for the cave monster cap to be filled by monsters hidden in small, inaccessible caves. The chance of this happening would increase as you spent time in an area, for example building a base or exploring and lighting the visible caves. With the new despawning system in 1.16, the hidden monsters are now able to despawn regularly, so new ones can spawn in other places. Monsters should now regularly respawn on full blocks in places you have already visited but have not fully lit.

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We're tracking this issue as MCPE-302, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Can you provide a screenshot of the lit area?