Something very wrong going on there. A professionally made blade shouldn't break at the join like that until its very old and well past its use by date.

I've had them go in a similar manner, including the jump, when I've cocked up the joining using the welder on my Startrite saw but that was pure operator error. Either poor welding technique or not getting the blade straight so there is a step on the back at the join. I rarely have problems when making the 112" blades for my Startrite vertical saw but my old Alpine horizonta/ / vertical is much more demanding.

Best guess is that the blade tracking is well out with the balde not sitting properly back against the rear bearing and / or not properly held parallel between the the side bearings.

The common small horizontal / vertical bandsaws are notoriously hard on the blades due to the small wheels, short wheel centres and rapid twist betwixt wheel and guide. Being made to sell at an economic price the various alignments and adjustment arrangements are not as well controlled as one would ideally like.

Best to make sure that the blade is sitting true on the rear roller and properly held between the side rollers with minimal tension applied. Then make sure that the blade is tracking ture on the main wheels without touching any flanges. (The drive on my big Startrite can be disconnected allowing the wheels to be spun by hand which makes life much easier. No flanges on the wheels either but setting up from scratch isn't trivial.) Once the balde is running true in its natural position you can then carefully crank the tension up re-adjusting as needed to keep the blade running free.

Being one of the early imports my Alpine moved all over the place as tension was applied. I had to run it with the cover open to see what was going on.

Clive