Multicolumns tables in LaTeX writing are not in correct order - charts

Question

I am writing an article and the template is in LaTeX, and I need to insert a multicolumn table, the problem is, I have knowledgement just with the basics about LaTeX writing and i am finding some trouble with the organisation of the columns.
This is how the table should look like (image inside Word doc): Word
And this is how the code that i am using is being compiled inside LaTeX: LaTeX
Here is the code:
\begin{table*}[!htb]
\centering%
\caption{Parâmetros obtidos para o ajuste utilizando o modelo de Langmuir.}%
\label{tab:resul}
\centering%
\begin{tabular}{c c c c}
\hline
Modelo de Langmuir:
\begin{minipage}{7cm}{\begin{equation}\label{eq:Uxy}
\frac{\\Qmax\ K_L Ceq}{\\1\ +K_L Ceq} = Qe
\end{equation}}
\end{minipage} \\
\cline{1-4}
\multicolumn{2}{c|}{\textbf{HDL Calc}} & \multicolumn{2}{c}{\textbf{HDL SDS Calc}} \\
\hline
Qmax & K(L/mg) & Qmax(mg/g) & K(L/mg)\\
\hline
690,6 & 0,011 & 132,3 & 0,136\\
\bottomrule
\addlinespace
\end{tabular}
\fonte{Autoria própria (2021).}
\end{table*}
Any help with the code?