What you do next may depend on how "off/wonky" your block/units may be.
Can you post a picture?
I think that if the "base/foundation" is off, the rest of it will probably off.
If you are up to it, taking the blocks apart - repressing the pieces so they return to approximately their original size and shape - and resewing them might be something to consider.
Or - as another thought - after/since you have an idea of what is currently off/wrong/frustrating with the blocks/units you have just sewn - how about setting them aside and making some more that will go together better. Then - decide what to do with the wonky ones. You might decide to live with them "as is" - or you might decide to redo them.