The reason for what the other two garment decorators are stating is because your dtg printer uses a gravity feed bulk ink system. Thus, the height of the ink bottles needs to be at the correct height or it can affect how the ink flows. If the bottles are too high, you will have too much pressure on the ink in the print head and lines that will force ink to start dripping from the print head. If the ink bottles are too low, there will not be enough suction power from the print head to keep the ink flowing. Thus the reason for why both of them suggested to check the height of your print head. You should talk to the manufacturer of your dtg printer to see what height they suggest the bottles to be at.
One of the other reasons for why ink might be dripping from the bottom of the print head is the wiper blade is not working properly. The wiper blade should clean the bottom of the print head after all cleaning functions have been performed. If the wiper blade is not clean, it will not clean the print head. Thus, ink will build up on the print head and will drip down over time. You will probably also want to check the seals around the capping station to make sure ink has not accumulated there as well.
A worse case scenario would be your print head is delaminating and the ink is allowed to come out of the sides instead of through the piezo nozzle plate. That would require the print head to be replaced. But before you go through this process, contact your dtg manufacturer / distributor and see what technical support they suggest.