Attach (recommended) or Link to PDF file here:
http://education.ohio.gov/getattachment/Topics/Special-Education/Preschool-Special-Education/ETR-Preschool-Planning-Form.pdf.aspx

- Web browser and its version: Firefox 89.0.1
- Operating system and its version: Windows 10 10.0.19043.1052
- PDF.js version: commit 5d251a3a3e7bfaa8fbfa07f0b7f9901eb3f999d9
- Is a browser extension: No

Steps to reproduce the problem:
1. Enable XFA support
2. Open form

What is the expected behavior? (add screenshot)
Shapes stay inside table cells
![image](https://user-images.githubusercontent.com/7104454/122572782-1252a580-d01c-11eb-9d0f-5fed46d6f2fe.png)

What went wrong? (add screenshot)
Shapes fall outside cells (among other issues)
![image](https://user-images.githubusercontent.com/7104454/122572885-2d251a00-d01c-11eb-8863-fa3b9969f0ea.png)

this.dataColumnCount = getInteger({
      data: attributes.dataColumnCount,
      defaultValue: -1,
      validate: x => x >= 0,
    });
    this.dataLength = getInteger({
      data: attributes.dataLength,
      defaultValue: -1,
      validate: x => x >= 0,
    });
    this.dataPrep = getStringOption(attributes.dataPrep, [
      "none",
      "flateCompress",
    ]);
    this.dataRowCount = getInteger({
      data: attributes.dataRowCount,
      defaultValue: -1,
      validate: x => x >= 0,
    });
    this.endChar = attributes.endChar || "";
    this.errorCorrectionLevel = getInteger({
      data: attributes.errorCorrectionLevel,
      defaultValue: -1,
      validate: x => x >= 0 && x <= 8,
    });
    this.id = attributes.id || "";
    this.moduleHeight = getMeasurement(attributes.moduleHeight, "5mm");
    this.moduleWidth = getMeasurement(attributes.moduleWidth, "0.25mm");
    this.printCheckDigit = getInteger({
      data: attributes.printCheckDigit,