Wood flooring damage?

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I have been in my current home for 3 years when I moved in the flooring had nice size gaps between the floor boards like they are coming apart over time I am noticing some peeling from sweeping and mopping as well as scratches and a few dings I use covers on the furniture legs but I have three small children I know high traffic places will have wear an wear but could this be considered normal I wouldn’t want him to keep my deposit over a mundane thing I’ve been a good tenant paying rent on time keeping the place up asking my landlord before I do anything to the house that they my not be ok with.