**The broken flange is the leading suspect.** A toilet can feel firmly attached yet still move slightly under someone’s weight. That movement can break the wax seal; compressed wax cannot spring back to close the resulting gap. Oatey identifies rocking from a damaged flange as a cause of seal failure. [Oatey’s flange guidance](https://www.oatey.ca/faqs-blog-videos-case-studies/blog/how-repair-toilet-flange)

For a lasting repair:

- **Repair or replace the flange.** A repair ring can restore damaged bolt slots if the remaining flange and drain connection are sound. Extensive damage calls for replacement. Secure it to solid flooring, and repair any soft or rotten subfloor.
- **Check the flange height.** A conventional flange should rest on top of the finished floor. A recessed flange may need a compatible extender so the seal compresses properly. [Flange repair guide](https://www.oatey.com/resources/project-guides/how-repair-toilet-flange)
- **Support the bowl evenly.** Before installing the seal, dry-fit the toilet and use plastic toilet shims wherever needed to eliminate rocking. The floor and shims must support the bowl.
- **Install a fresh seal and tighten evenly.** Seat the bowl carefully, then snug the bolts. Overtightening can crack the porcelain. If you lift the toilet after compressing the wax, use another new ring.

A properly installed wax seal should last many years. Reinforcement cannot compensate for movement or incorrect flange height. Given that yours is broken in several places, I would address the flange before buying another seal. [Oatey’s wax-ring guidance](https://www.oatey.ca/faqs-blog-videos-case-studies/blog/oatey-101-wax-rings)