[Tex/LaTex] Table of contents different margins

Question

I don't know why I have different margins in my table of contents.

It looks like this, and I would like to have all the lines with the same margin.

a

All of those are chapters, and Bibliography ad list of figures are chapters too, so I don't know why it looks like that.

Thank you for your answers.
Sorry for not being very specific.
I have this code:

\documentclass[12pt, notitlepage]{report}

\usepackage[style=numeric, backend=bibtex, sorting=nyvt]{biblatex}
\addbibresource{references.bib}

\usepackage[nottoc]{tocbibind}%I use this package to add bibliography and list of figures to the table of contents


\begin{document}
    \renewcommand{\chaptername}{}
    \renewcommand{\thechapter}{}%I use this command to eliminate the numbers of the chapters

\tableofcontents

\chapter{Introduction}

\chapter{Research}

\printbibliography
\addcontentsline{toc}{chapter}{Bibliography}
\end{document}

And I get this:

I would like to have the bibliography at the same level as the other chapters, or viceversa, the chapters at the same level as the bibliography.

Answer 1

Set the counter for secnumdepth to get unnumbered chapter.

\documentclass[12pt, notitlepage]{report}

\usepackage[nottoc]{tocbibind}
\usepackage{geometry}
\geometry{showframe}
\usepackage[style=numeric, backend=bibtex, sorting=nyvt]{biblatex}
\addbibresource{biblatex-examples.bib}

\setcounter{secnumdepth}{-1}
\begin{document}

\tableofcontents

\listoffigures
\listoftables
\chapter{Introduction}
\cite{companion}
\chapter{Research}
\printbibliography[heading=bibintoc]
\end{document}