Why is my Samsung S5 ringing when my home phone is ringing? So annoying!
If you have Verizon FIOS there is a Find Me setting to send your home calls to your cell and there is a call forwarding feature to forward home calls to your cell as well. If you have FIOS, log in and check the settings. If not sorry I don't know.
The feature mentioned above is otherwise known as simultaneous ring. Most providers offering some type of VoIP or non-PSTN service tend to offer this feature. Make sure it's not turned on accidentally.
If you don't know where it is turned on, ask the next caller which number they dialed to reach you. From there you'll know which one is not acting right.