Landlord Put For Rent Sign In The Front Yard 6 Months Before Our Lease Is Up And People Won’t Stop Knocking. Today Someone Went Into The Backyard.

As the title says. Our lease is up at the end of July and we noticed they put a for rent sign in the front yard last week. Since, people have been knocking on our door about renting. This evening, someone went into the backyard and then knocked on the front door persistently until I answered. When I told them I’m not the landlord, they proceeded to tell me a sob story and when I reiterated I’m not in charge of the property and closed the door they knocked for a while longer and thankfully finally left. When I notified the landlord, they told me not to remove the sign. I understand this is likely within their right since it’s their property but do we have any ground to stand on here? If helpful, we live in Texas.