Over constrained sketch bug ? screen cast attached

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I have a fairly simple sketch. It's a 2D sketch of a house floor plan. Suddenly, after working in this sketch for several hours this random over constraining error started occurring.
I use the line tool to create a line. The line goes in fine, but I cannot dimension the line, or constrain it. I get an over constrained error.
I also have realized that other lines in the sketch I made previously, that I didn't have final dimensions on so I could drag them around, I cannot drag them anymore. It seems like any type of dimension I try to make in this sketch now causes an over constrained error.
Screencast attached.
I saw some other posts where people said to go into preferences/preview and 'uncheck' sketch box. I do not have this option available to me.