Keys in a column presses other keys on another column on the same row.

Some keys in a column when pressed also presses another key in the far left column from its row. What could cause this problem?

So I noticed that certain keys of my keyboard have outputs when pressed and i noticed that they are in a column. My theory is it probably got wet from some droplets due to a typhoon.

For example, when i pressed T it also presses the Tab at the same time. It also happens with F4 and Esc, 5 and Tilde, F and the Caps lock and V and shift. But this does not happen vice versa, so if Tab is pressed, there is no T.

What could be the cause of the problem? Is it the switches or the PCB itself?

Additional Info:

The keyboard: PCB Layout

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