It looks like the controller has jumped into float mode. You might have voltage drop in your system. The only way to fix it is to use thicker gauge wire from controller to the battery or raise the bulk voltage on your controller (if its possible).
The way to check if this is the cause you would have to measure the actual voltage between what the controller is showing and the voltage on the battery terminals. If the controller says 14.4 volts, the voltage on the terminals should also read 14.4 volts. Once the controller reaches 14.4 volts it stays there for a while then switches to float. You can trick it to go back into bulk mode by disconnecting the panel, and then disconnect the battery to reset the controller.
I used the same controller you have before they are good controllers but very basic. How much amps are you getting? I know when I had the same controller hooked up to my 240 watt panel it was maxing out at 6 amps output.
The directions on your controller say its programmable, you might have to adjust the float voltage higher. You can take it all the way to 14.4 volts if it lets you. That wont damage your batteries, the sun will go down before your 105 ah battery is fully charge. If you have voltage drop even 14.4 volts will be too low. But for your large batteries you have to keep them at 14.4 volts almost all day, otherwise you just trickle charging them.
If possible get a Led meter that can measure amps, with solar its all about the amps. I use the 90 volt 30 amp combo meter (cost 20 dollars) , it connects between controller and battery. Knowing how much amps your panels are putting out will bring happiness into your solar system.
This is how I keep an eye on my solar system. Thats the ecoworthy 20 amp mppt (cost 100 dollars) thats connected to my 240 watt panel, it has an lcd screen that tells me volts/amps but its hard to read. I prefer the big LED's which I can read from a distance.
