Just curious to why, # 9503025

Doing family history stuff online I came across a distant cousin, T H Holladay, who died young, unmarried, killed in a dynamite explosion at work in Harris Co, TX, Baytown 1922.

I found his page with photo of marker,, # 9503025,, but he is sharing a stone with another male, who,, according to Texas CoD,, was married, who was twelve years older and died of Lobar Pneumonia twelve years before T H Holladay.

I'm sure there is a logical explanation for the double marker, for two men that died so far apart and didn't even know each other as far as I know.

Anyone here know the reason, or have any thoughts?