Brown spots on yellow tomatoes

Hello,

New to the forum, thank you for the welcome! We just started vegetable gardening at home. We have some past experience but are growing yellow tomatoes for the first time and have two questions it would be great if someone can help with:

1) We grew yellow stuffer tomatoes but they have turned red. Is it normal for yellow tomatoes to continue changing colour once they have gone yellow?
2) Our yellow balconi tomatoes have developed these small brown spots (picture attached). Does anyone would know what causes this and if they are still safe to eat?

Thank you so much