This is a very common concern. Lumps after any filler injection are very common, especially if a needle rather than a cannula is used to perform the injection. Injectors who use a needle tend to inject dollops of filler rather than “air brush” it place as when a cannula is used. What I mean by that is that with a cannula, multiple small threads of filler can be placed and this gives you a much more precise placement of the filler. That said, fillers like Restylane will remain soft but what you are likely feeling is the result of trauma from the needle. This should settle in time and is really of no consequence. If you like your result, you might consider a long term filler like Bellafill in a year when the Restylane has gone. This filler last 5 years and phenomenal results can achieved.
This video on filler safety helps explain some of the issues that can be seen after a filler injection.