Doesn't sound quite that unlikely to me. You played slowdown all 4 games, and your opponents did as well in 3 games. So here's a quick-and-dirty estimation. You would expect your scoring to be between, say, 40 and 55 points *most* of the time in that situation. If you had a 1-in-15 chance of hitting 44 exactly on any given night (and a normal distribution might actually make it more likely), your chances of hitting it 4 times in a row are about 1-in-50,000. Add in your chances of hitting 43 four times in a row, same for 45, etc... and you're in the ballpark of a 1-in-5000 chance that you get the same output 4 games in a row with some number.
If you and your opponents had both played uptempo, your range of scores gets a lot wider, so the odds of 4-in-a-row get a lot slimmer.