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If the plant has not rooted into the soil, this is not normal and you will need to access the planting and the soil conditions.
The link below will help refresh you on the care and growing conditions neeeded.

https://www.gardeningknowhow.com/ornamental/shrubs/rose-of-sharon/rose-of-sharon-bush.htm

In some cases with rose of Sharon, they need a heavy rejuvenating pruning to get back to growing well. In this case perhaps the rain water is hanging around the root base too long and drowning the shrub. Clayey soils can form a swimming pool of sorts around root systems. Some, even the same, shrubs deal with it better than others. If you can create a drainage path away from the shrub affected, that may be a big help. Digging a trench on a downhill side of the shrub that is 2 to 3 feet deep and about 12 to 15 feet long, fill halfway with 3/4 gravel, cover with a landscape fabric and fill in with gravel and dirt mix. This will create a drainage pathway to help take water away from the root system. Here is a link to articles on Rose of Sharon care and growing for you as well: https://www.gardeningknowhow.com/ornamental/shrubs/rose-of-sharon/

Like all blooming shrubs, rose of sharon should be pruned annually. This keeps the blooming wood young and robust. Prune in early spring before leaves emerge or during the winter. I know of ones over 20 years old that show no sign of decline.

Excessive shade: Rose of Sharon will not bloom up to its full capabilities if given too much shade.
Rot: During rainy summers, rot can set in and ruin the flower buds (although you may not notice it from the outside). The same effect can be produced by excessive watering if you water overhead.
Drought: Conversely, during dry summers, rose of Sharon flower buds may be damaged from drought and fail to open.
https://www.gardeningknowhow.com/ornamental/shrubs/rose-of-sharon/rose-of-sharon-bush.htm

Rose of Sharon bushes benefit a lot from occasional pruning, particularly if they're several years old. In late fall, try doing some serious rejuvenation pruning - that might be all the plant needs to come back strong in the spring. This article will tell you more about it:
https://www.gardeningknowhow.com/ornamental/shrubs/rose-of-sharon/pruning-rose-of-sharon.htm