Your TDS meter isn't actually recording TDS. Its actually recording conductivity of the water. So anything that dissolves in the water that doesn't conduct electricity won't be read. On the other hand, there's stuff that does increase conductivity, but won't affect PH/GH/KH.
TDS meters are great for checking your RO filter to make sure its filtering stuff out of the water.
TDS meters are great for approximating GH/KH, providing you are starting from low TDS water, and know what you've added to the water and how it will affect TDS.
So they're great for a shrimp keeper when mixing water before putting it in the tank. You can check your RO filter is working. Once you've figured out how your mineralizing supplement affect the TDS meter, you can use it to tell when you've added enough, instead of messing with test kits and drops.
However once the water hits the tank, TDS starts becoming less useful for the reasons mentioned above.
So for my tanks.
RODI Water = 0-3 on my TDS Meter
Once I add Seachem Replenish to the water I shoot for a TDS of 100-125 which gets me a GH of 4~5.
After adding it to my tank, the TDS usually rises to ~150-170.
A quickly rising TDS may be a sign there's something in the water that is negatively affecting water quality, but you won't know until you break out the test kit and actually measure GH/KH/PH and see if what is raising conductivity is also raising GH/KH.
Also, do you have rocks in your tank? If so, those are the likely cause. But again, you can't know exactly how they are affecting the water without testing. It may be they are leeching Iron into the water, which raises conductivity (What your TDS meter reports), but won't do much to GH/KH.