It looks or at least seems like a white jumper wire is missing. These are all parallel wired so the top right speakon white wire ‘should’ connect to the tip of the 1/4” jack (highest) point with solder on it along with the white wire to the right of the picture. Otherwise this jack wont be inter-connected like the others. The black connects with the black on the 1/4” jack.
It may be my eyesight or bad soldering but it looks like a wire has come off the bottom left banana plug positive. In the centre of the existing wires, there is a noticeable solder blob with a hole. Commonly indicative of a broken wire joint. I could be wrong though. Out of curiosity, where do the wires go on the left of picture and where do they go to the right of the picture?.
Martin