WA Trustee Sale: Previous owner entitled to property after sale?

[Evan Anderson]

I just bought a property at a trustee sale and am now the legal owner. There were squatters that we paid to move out and now the property is vacant. According to WA law (RCW 61.24.060), "The purchaser at the trustee's sale shall be entitled to possession of the property on the twentieth day following the sale." Since I am the legal owner, what does "entitled" mean? Can the owner move back into the property and force us to go through the whole eviction process? Any help is much appreciated!! I am talking to lawyers as well just thought I would post here first.