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Since it is only a week planted, I would carefully dig it back up and make sure it is at the same level as it was in the pot. But it looks like you have the bud union above ground, so that is good.

I also would widen the grass free area around it and add 2 to 3 inches of mulch around it. Do not touch the stem with the mulch. Start it an inch or so from the stem.

It could be the birds digging around. Here is more:

https://www.gardeningknowhow.com/plant-problems/pests/animals/birds-digging-lawn.htm

Sounds like the rosebush has become Root Bound. When left in containers too long, their roots start to grow in the shape of the container. When the roots become wrapped around enough, they strangle one another. The rosebush can no longer take up all that it needs to survive and dies. I have seen this many times and once they get that root bound, there is no way to save them. I have tried taking them out of the container and trimming away some of the roots and replanting. Just did not work. Sorry to say....

Rose Trees or Standards are Grafted Creations by man, not naturally occurring in nature. Many times, especially in cases where they have flowered heavily into the hard frosts and winter season, the grafted on rose bush or rose bushes die. Because they are way up at the top of the hardy trunk stock they were grafted to. If you have had consistent 50 degree nights for at least two weeks and there is no sign of growth, then they are likely dead. If you get growth down towards the bottom of the rose tree, that is the hardy trunk stock pushing out its own growth and not the rosebush you enjoyed. I live in a Cold Climate area here in Colorado, USA. Most rose trees are planted like annuals here as they just do not survive a hard winter.

Pick a sunny spot with 6 to 8 hours of sun a day. They should be planted the same depth as they are in the container. Dig the width wider than the rootball. When setting it inside the hole, make sure the base of the plant is level with the ground. If not, add more soil if it is too low, or dig the hole deeper if the base of the plant is below the soil level. Keep it watered till it is establilshed.

https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/care-knockout-roses.htm

These articles should help:

https://www.gardeningknowhow.com/ornamental/flowers/roses/controlling-rose-cane-borers.htm

https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-canker-fungus.htm